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Changes in the earth and its atmosphere
Which is the most abundant gas in the atmosphere?
Which was the most abundant gas in the early atmosphere?
What is the approximate percentage of oxygen in the atmosphere today?
100 per cent
80 per cent
20 per cent
What caused the proportion of oxygen in the atmosphere to increase?
Which of the following is a reason for the decrease in carbon dioxide in the Earth's atmosphere?
Its reaction with oxygen
It condensed to form the oceans
It became locked up in fossil fuels and sedimentary rocks